Implement basic mojo Permission service and use it for Geolocation.

content/content_common_mojo_bindings.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'content_common_mojo_bindings',
       'type': 'static_library',
       'dependencies': [
         '../mojo/mojo_base.gyp:mojo_environment_chromium',
         '../mojo/public/mojo_public.gyp:mojo_application_bindings',
         '../mojo/public/mojo_public.gyp:mojo_cpp_bindings',
       ],
       'sources': [
         # NOTE: Sources duplicated in //content/common/BUILD.gn:mojo_bindings.
         'common/geolocation_service.mojom',
+        'common/permission_service.mojom',
         'common/render_frame_setup.mojom',
 
         # NOTE: Sources duplicated in
         # //content/public/common/BUILD.gn:mojo_bindings.
         'public/common/mojo_geoposition.mojom',
       ],
       'includes': [ '../mojo/public/tools/bindings/mojom_bindings_generator.gypi' ],
       'export_dependent_settings': [
         '../mojo/mojo_base.gyp:mojo_environment_chromium',
         '../mojo/public/mojo_public.gyp:mojo_application_bindings',
         '../mojo/public/mojo_public.gyp:mojo_cpp_bindings',
       ],
     },
   ],
 }